Keep your feet warm with the Heat Holders Men's Rook Block Twist Crew Socks. They are made of 91% acrylic, 5% nylon, 3% polyester, and 1% elastane. The socks are non-binding, providing relief for cold feet due to circulation problems, and their tog rating of 2.34 provides extreme thermal qualities. The twist knit pattern adds stylish texture. Heat Holders Men's Rook Block Twist Crew Socks Black, Large - Western And Thermal Socks at Academy Sports